[jira] [Created] (AURORA-548) scheduler should always show tasks_lost_rack_XXX metrics

["David Robinson (JIRA)" <ji...@apache.org>]

David Robinson created AURORA-548:
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             Summary: scheduler should always show tasks_lost_rack_XXX metrics
                 Key: AURORA-548
                 URL: https://issues.apache.org/jira/browse/AURORA-548
             Project: Aurora
          Issue Type: Task
          Components: Scheduler
            Reporter: David Robinson


The scheduler's /vars endpoint only exposes a tasks_lost_rack_XXX metric when tasks in a rack have been lost (a tasks_lost_rack_XXX key has a non-zero value). If no tasks in a rack have been lost then metrics for the rack are not exposed. This makes the metrics difficult to use for alerting purposes --  it's impossible to tell whether the rack does not exist or exists but has had no lost tasks. Each rack should have an entry in /vars regardless of whether there have been any lost tasks.

Sample metrics:
tasks_lost_rack_aab 3
tasks_lost_rack_aae 4
tasks_lost_rack_aah 2
tasks_lost_rack_aai 3

Expected metrics:
tasks_lost_rack_aaa 0
tasks_lost_rack_aab 3
tasks_lost_rack_aac 0
tasks_lost_rack_aad 0
tasks_lost_rack_aae 4
tasks_lost_rack_aaf 0
tasks_lost_rack_aag 0
tasks_lost_rack_aah 2
tasks_lost_rack_aai 3



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